Windows Button Customization

So I was playing around with my SP3 today while connected to an external monitor, trying to get it to a happy point with the whole display scaling problem. While doing this (and I pretty much got it to a perfect point, finally!) I thought about the idea of when I hit the physical Windows button, it would open up the start screen on the SP3 instead of my external. Is there anyway to do such a thing? (side note: in order for my setup to work the way I want it, the external has to be my primary monitor. Keep that in mind when answering my question).